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本帖最后由 jjlamshushushu 于 2014-2-17 09:41 编辑 1 t, T/ Y" U8 b( z; Z
& s4 y( o8 E, N! N/ s! G: q* U各位,下面摘录章节的红色字部分如何理解?
, b& t# O' x' U: N3 |0 C3 [/ e比如,变压器的工作环境温度为105°C,那么这个Overheating Test就应该在105°C环境下进行吗?
; d3 ~; w& n$ z! |# } 在IEC61558里,这点是很明确的,但UL5085-3标准里就不太明白;
/ F3 B5 ?( K0 F8 H& O) U4 X/ J 现在我们有一款UL5085-3的变压器,在25°C下进行冷态短路测试出现冒烟流脓现象(保护装置失灵),2 v* p$ x2 U4 g% [% q
而在105°C环境温度下进行温升稳定以后再热态短路测试就是正常的(正常保护了),. X- Q- ?% |/ T
请问,这种变压器算合格吗? 欢迎大神们指点迷津,谢谢!!!
; x1 k4 l2 T B7 u4 M1 L' s* O--------UL 5085-3 Clause 33 Overload Heating Test
* _, b ^2 }! Q2 C0 q% {1 e" g: H33.1 General P- S4 F, ^: q( m% S
33.1.1 The transformer shall be subjected to the overload tests described
& O& Q+ S1 F& ain Clauses 33.2.1 – 33.2.8, asspecified in Tests in Clause 18. # v/ w+ C2 E! I1 x( o; `+ X
A protective device that is relied upon to open the circuit as a result of the3 q V0 b3 V# R4 i. Y2 x) r& E2 E
tests shall be one that has been investigated for this purpose.+ h, X i" Q1 I# w6 B, v* S
33.1.2 The temperature rises specified shall be based on an assumed ambient temperature of 25°C g2 m% ]: s* |7 [! n
(77°F), but a test may be conducted at any ambient temperature of 21 – 30°C (70 – 86°F).
, Z9 l6 G2 k- T* z) rIf the operationof an automatic thermal control during the test limits the temperatures under observation,
2 Q: ^5 H. ~, h# v" dno temperature higher than 25°C plus the specified maximum rise shall be acceptable.
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